The following is an excerpt from A Comprehensible Guide To J1939 by Wilfried Voss. SAE J1939 is a very ingeniously designed protocol that takes a resourceful advantage of the CAN 29-Bit message identifier. Rather than relying on a myriad of protocol functions, SAE J1939 uses predefined parameter tables, which keeps the actual protocol on a comprehensible level. However, these parameter ...

2024年8月1日 · PGN 65247 (Electronic Engine Controller 2 – EEC2): Reports engine temperature, pressure, and other critical parameters. PGN 65253 (Engine Fluid Level/Temperature): Provides information on engine fluid levels and temperatures. PGN 65263 (Turbocharger Information): Transmits data about turbocharger performance and status.

2024年3月25日 · In the above example, I refer to PGN 65262 – Engine Temperature. In this case, the SPNs describe the use of the data field for parameters such as Engine Coolant Temperature, Fuel Temperature, and more. As I mentioned, the SAE J1939/71 Standard contains descriptions of all PGNs and SPNs. The following image gives you an example based on PGN 65262:

One standard across heavy-duty vehicles. In simple terms, J1939 offers a standardized method for communication across ECUs, or in other words:. J1939 provides a common language across manufacturers.. In contrast, e.g. cars use proprietary OEM specific protocols.. The J1939 standardization is a key enabler to data logging use cases across heavy-duty vehicles - …

The PGN is a number defined in the SAE J1939 standard that groups together several SPNs into a meaningful group. The PGN is part of the CAN identifier. The 8-byte data (PDU) contain the values of individual SPNs. The example below shows a PGN 65262 (0xFEEE): PGN 65262 Engine Temperature 1 - ET1. Part of the PGN Value Remarks . Transmission ...

• Actual Engine – Percent Torque (PGN 61444, SPN 513) • Engine Coolant Temperature (PGN 65262, SPN 110) • Wheel-Based Vehicle Speed (PGN 65265, SPN 84) • Boost Pressure (PGN 65270, SPN 102) The TCU transmits the following standard transmission information: • Shift in Process (PGN 61442, SPN 574) • Torque Converter Lockup Engaged ...

The following is an excerpt from a table for the parameters in the PGN 65263 Engine Fluid Level/Pressure group. Parameter PGN SPN Offset Data Length Update Rate Scaling Range Coolant Level 65263 111 7 bytes 1 byte 500ms 0.4 %/bit 0 % offset 0-100 % Coolant Pressure 65263 109 6 bytes 1 byte 500ms 2 kPa/bit 0 kPa offset 0-500 kPa

The J1939 standard specifies the encoding of raw CAN bus data through the use of Parameter Group Numbers (PGN) and Suspect Parameter Numbers (SPN). The PGNs reflect CAN IDs and are given specific 'group names' (e.g. 'Electronic Engine Controller 1'), while the SPNs reflect specific parameters packed in the CAN frame data bytes (e.g. EngineSpeed).

2020年1月17日 · For example, the engine has the source address 0x00, the steering controller has 0x13, the body controller has 0x21 and the terminal has 0x28. Bits 8-23 (bytes 1 and 2) contain the parameter group number (PGN). The PGN defines which parameters belong to the group and which bit range of the 64-bit payload encodes which parameter.

The PGN is a key identifier for J1939 messages and is crucial for message filtering and processing. The PGN is part of the CAN ID. ... an SPN could represent a temperature reading, engine speed, or a fault code. SPNs are typically associated with a range of possible values, units of measurement, and diagnostic information. The SPN is 19-bit in ...